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I'm saying this not as a specialist but based on my studies of bungo (literary Japanese) and as someone who lived in Kansai for 4 years, but as far as I know there is nothing particularly Kansai-ben-ish about the concept of keigo in itself. What you've heard may have to do with particular forms that keigo uses nowadays, by judging from my own exposure to ...
I suggest A Guide to Remembering Japanese Characters, by Kenneth Henshall. It gives both the true etymology (if known) and a mnemonic explanation that is more useful to memory. It seems to be exactly what you were looking for.
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